nidge20 user said 1 hard drive and not 1 PC. Don is correct, you can only install 1 key on one PC. However, you can have a back-up drive for your PC and have the same key installed on that hard drive. While that is legal, Windows may call one of the installations as not genuine, but I doubt it. If I uninsulated a 32bit version and replaced it with a 64bit version, or vice versa, which I have done, I have never had a problem with the key. And if I were to pop the 32bit drive back in I believe it would update also. So I believe you can have both versions installed on two different hard drives, as long as those drives go into the same computer. .if i install win 7 64bit on one hdd+ win 7 32bit on another will the product key
work for both and will i be able to update both thanks.